Improvement in propulsion of vessels



" T. B. RAYMOND.

improvement in Propulsion of Vessels.

No. 122,650,. PatentedJan.9,187 2.-

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fan I UNITED STATES THOMAS' B. RAYMOND, OF WINONA, MICHIGAN.

IMPROVEMENT IN PROPULSION O F VESSELS.

Specification forming part of Letters Patent No. 122,650, dated January9, 1872.

others skilled in the art to make and use the same, reference being hadto the accompanying drawing which forms a part of this specification.

My invention relates to improvements in screw-propellers; and itconsists in the application to a stationary tube surrounding thepropeller, for preventing lateral displacement, of diametrical plates toreceive the water at the rear from the propeller and prevent it fromwhirling around in said tube.

Figure l is a longitudinal sectional elevation of a boat having myimprovements applied; and Fig. 2 is an elevation of the stern.

Similar letters of reference indicate corresponding parts.

A is the ordinary propeller; B, the tube surrounding it; and O, vanes orplates in the tube behind the propeller for receiving the water andchecking the tendency to whirl around, and thereby essentially check thewhirling,

while the water is subject to the action of the screw.

I am aware that stationary tubes surrounding the wheel, and likewisethat spiral vanes, have been used before; but they have been foundimpracticable on account of the whirling of the water while subject tothe screw and separated from the surrounding water which I propose toovercome in great measure, if not entirely, by the employment of thesevanes be hind the propeller, and thereby render the employment of thetube a success. In this example the tube is extended beyond thepropeller rearward to support the said vanes; butit may terminate nearthe propeller, and the vanes ,may be otherwise supported.

. rical plates (J, constructed as described, in combination with apropeller, A, as and for the purpose specified.

THOS. B. RAYMOND.

Witnesses:

GEORGE P. COBB, T. G. GRIER.

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